Facing a single-phase wall outlet and a three-phase motor is a common problem in small workshops and CNC setups. A variable frequency drive (VFD) acts as both a phase converter and a speed controller, letting you run a three-phase motor from single-phase input. The four drives here all share that same basic job, but they span a wide price range and very different output ratings. The question is not simply which one is cheapest; it's which one matches the motor size and control demands you actually have.
Quick take
- The 750W unit is the entry-level choice for light single-phase-to-three-phase jobs.
- The Uimoso 3KW unit is the only 4HP drive here and includes a digital display.
- The two 7.5KW units differ in current capacity and output frequency range.
Listed price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Single To 3 Phase 750W 1HP 220V VFD | USD 32.99 | |
| Uimoso 3KW 4HP 220V VFD | USD 92.99 | |
| 1 To 3 Phase 7.5KW 10HP 220V CNC VFD (marddpair) | USD 119.39 | |
| 1 To 3 Phase 7.5KW 10HP 220V CNC VFD (findmall) | USD 130.11 |
Decision matrix
| If you need... | The listed option to consider |
|---|---|
| A drive for light loads | Single To 3 Phase 750W 1HP 220V VFD |
| A drive for mid-range motor loads | Uimoso 3KW 4HP 220V VFD |
| A 10HP drive with higher per-phase current rating | 1 To 3 Phase 7.5KW 10HP 220V CNC VFD (marddpair) |
| A 10HP drive with wider output frequency range | 1 To 3 Phase 7.5KW 10HP 220V CNC VFD (findmall) |
Product notes
Uimoso 3KW 4HP 220V VFD
This 4HP drive is the only one here with a rated horsepower of 4 HP. It accepts 1 or 3 phase input while outputting three phases, and includes a smart digital display and multiple protection functions. The input current range is 0-14A, and the unit has passed CE certification. It sits in the middle of the price group, so if you're looking for a balance between a 1HP starter unit and a 10HP heavy-duty drive, this is the power class that matches a 3-4HP motor. The trade-off is the power ceiling: if you actually need a 10HP drive, this unit's 4HP rating is well below that level. Confirm your motor's full-load amps against the 0-14A range before committing.
1 To 3 Phase 7.5KW 10HP 220V CNC VFD (marddpair)
This 7.5KW 10HP drive uses SPWM control, has an input frequency range of 48-63 Hz, and accepts 1 or 3 phase input for three-phase output. A notable specification is the 40A maximum per-phase current, which is higher than the 20A on the other 7.5KW drive in this group. The input terminals are labeled R.S.T, the output U.V.W, with P+/PR for a braking resistor and E for ground. For a 10HP motor that draws more current, this unit's 40A rating may be the more relevant match. The trade-off is that the 0.1-2500Hz control range stops short of the 0-3200Hz range on the competing 10HP drive.
Single To 3 Phase 750W 1HP 220V VFD
This 750W 1HP drive is the lowest priced unit in this comparison, and the model is FOR T13-750W-H. The working frequency range is 1.0-99Hz and the rated current is 3.41A. It's a small way to add speed control to a light three-phase motor or to test a VFD setup without a large investment. The limitation is the power ceiling: at 1HP it won't handle the heavier 4HP or 10HP loads the other drives target. Also, 110V output is compatible only with 110V three-phase motors, so check your motor's voltage before relying on this unit for a 220V three-phase load.
1 To 3 Phase 7.5KW 10HP 220V CNC VFD (findmall)
This 7.5KW drive is the highest priced unit in this set and the only one with an output frequency range of 0-3200 Hz. It uses SPWM control with a 48-63 Hz input frequency and a 20A maximum per-phase rating. The working temperature range is -10 to 40℃ and the humidity rating is 0-95% relative humidity. If you're choosing between the two 10HP drives and your motor's current draw is modest enough for 20A, this is the one with the wider output frequency range. The limitation is the higher price relative to the other 10HP drive. Make sure your motor doesn't need more than 20A per phase, because the other 7.5KW drive has a 40A maximum per-phase rating.
Final recommendation
- If you have a light-load motor, the Single To 3 Phase 750W unit gives you an entry point.
- For mid-range three-phase motors, the Uimoso 3KW drive is the match.
- For heavier three-phase motors with higher current needs, the marddpair 7.5KW drive is the stronger candidate.
- For heavier three-phase motors with a wider output frequency range, the findmall 7.5KW drive is the better fit.
